/Engine/Plugins/Runtime/nDisplay/Source/DisplayCluster/Public/IDisplayClusterCallbacks.h
Called before applying ICVFX shaders
class FDisplayClusterPreProcessIcvfx_RenderThread : public TBaseMulticastDelegate_FourParams< void, FRHICommandListImmediate &, const IDisplayClusterViewportProxy *, FDisplayClusterShaderParameters_WarpBlend &, FDisplayClusterShaderParameters_ICVFX & >